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I think the signal to look for is an increase in flu mortality rate in February-May compared to October-January if that kind of data exists. Confirmed flu cases are almost never also tested for COVID-19 due to the sheer number of flu cases, but even a small percentage of those being doubled up might change the mortality rate. They would also cause community spread because people don't take the same precautions for "just the flu".

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both flu and covid kill the same kind of people, very old and frail ones. So in a sense they should be competitors, and they'll both kill fewer than if either disease were the only one.

Covid kills people who would survive the flu, so if someone catches both, they would have a higher chance of dying than from the flu alone, which would affect the flu's stats because these would be recorded as flu deaths.

Flu kills children, covid-19 doesn't. Not sure if there is an 'expected' percentage of flu deaths in children, but if so, we might estimate the covid effect by looking at those numbers.

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